Fuel Trim Malfunction - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 12-30-2004, 05:29 PM
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does anyone know about a fuel trim malfunction? Its on my OBDll #0173? I thought if I changed the fuel filter this would help. let me kn ow
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#2 (permalink) Old 01-07-2005, 09:00 AM
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in regards to the fuel trim malfunction, codes 0173, 1174 & 1175 are all signs of this problem. It can be a number of things, most likely a vacuum leak, (usually caused by temperature changes causing the manifold gaskets to break) however it could also be a fuel pressure problem. Being a 740il, with the M62 V8, it is probably the vacuum leak. Watch for cylinder misfires which suggests that the problem is getting worse. Take it to a mechanic and have him check out the air intake system. If this is the case BMW-Dealer mechanics will charge nearly $500. ghead

GOOD LUCK!
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#3 (permalink) Old 01-09-2005, 08:06 PM
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Quote:
Originally posted by daves7x20@Dec 30 2004, 04:29 PM
does anyone know about a fuel trim malfunction? Its on my OBDll #0173? I thought if I changed the fuel filter this would help. let me kn ow
[snapback]261259[/snapback]

Fuel trim rich, or fuel trim lean? Most likely lean. Check the intake boot for cracks or holes. Check the vacuum line on the back of the intake manifold.
With the engine running, spray some brake cleaner all around the intake manifold and the "backing plate" on the rear (pcv valve). If the rpm goes up noticeably by sucking in the brake cleaner, that's the leak.
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#4 (permalink) Old 01-14-2005, 05:07 PM
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Quote:
Originally posted by ///Matt@Jan 7 2005, 08:00 AM
in regards to the fuel trim malfunction, codes 0173, 1174 & 1175 are all signs of this problem. It can be a number of things, most likely a vacuum leak, (usually caused by temperature changes causing the manifold gaskets to break) however it could also be a fuel pressure problem. Being a 740il, with the M62 V8, it is probably the vacuum leak. Watch for cylinder misfires which suggests that the problem is getting worse. Take it to a mechanic and have him check out the air intake system. If this is the case BMW-Dealer mechanics will charge nearly $500. ghead

GOOD LUCK!
[snapback]266187[/snapback]
Matt, thanks a lot, now I have something to work with, the dealer just changed the oil seperator and removed the intake to do so. I think there may be a conncetion. Thanks again. Ill let you know what happens.
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#5 (permalink) Old 01-14-2005, 05:10 PM
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Quote:
Originally posted by TECH+Jan 9 2005, 07:06 PM--><div class='quotetop'>QUOTE(TECH @ Jan 9 2005, 07:06 PM)</div><div class='quotemain'><!--QuoteBegin-daves7x20@Dec 30 2004, 04:29 PM
does anyone know about a fuel trim malfunction? Its on my OBDll #0173? I thought if I changed the fuel filter this would help. let me kn ow
[snapback]261259[/snapback]

Fuel trim rich, or fuel trim lean? Most likely lean. Check the intake boot for cracks or holes. Check the vacuum line on the back of the intake manifold.
With the engine running, spray some brake cleaner all around the intake manifold and the "backing plate" on the rear (pcv valve). If the rpm goes up noticeably by sucking in the brake cleaner, that's the leak.
[snapback]267657[/snapback]
[/b][/quote]

Hey TECH, Thanks for the info. Ill try this over the week end and let you know.
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